Miata Mailing List: March 1993, Message #92
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   From: (none)
Subject: Jackson Racing MFM
   Date: (none)

Al Jenab asks about the Jackson Racing Modification (Old) for the
Miata.  I have not had any direct experience with the system but did
speak with several pepole who had the system or to several mechanics
who installed the system.  One major problem is engine computer
management system which piggybacks on the Mazda system.  There have
been significant problems with the system with poor idleing and
drivability.  Jackson would usually replace it with no problem. 
However, if it is discontinued you could be stuck.  Also, I don't
think that the performance upgrade was that great for the money; 0-60
of 8.9 sec which is just about 0.5 sec from stock (according to Miata
Magazine).  To do better you have to install a new header and exhaust
system.  Also from my reading of the Miata Magazine article (between 
the lines), I didn't get the impression that they thought that the 
conversion was that good. 

Herb Samuels